I'm having a lot of issues with my iPod (160GB classic). I synced it earlier and things went all right, then when I tried to use it it wouldn't respond to the click wheel and just froze up. I restarted the iPod and it did it again, and again until the battery was almost dead. I plugged it into my Mac and it won't even show up in iTunes now, even though I get a message every time it's open that it "can't repair the disk" and to "reformat as soon as possible". I know it's because the iPod is too full (only 67.7 MB or so left) and I just want to reformat it. any suggestions?